Create CONTRIBUTING-PL.md

docs/CONTRIBUTING-PL.md

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+# Współtworzenie RustDesk
+
+RustDesk z zadowoleniem przyjmuje wkład od każdego. Oto wytyczne, jeśli chcesz nam pomóc:
+
+## Współtwórcy
+
+Contributions to RustDesk or its dependencies should be made in the form of GitHub
+pull requests. Each pull request will be reviewed by a core contributor
+(someone with permission to land patches) and either landed in the main tree or
+given feedback for changes that would be required. All contributions should
+follow this format, even those from core contributors.
+
+Should you wish to work on an issue, please claim it first by commenting on
+the GitHub issue that you want to work on it. This is to prevent duplicated
+efforts from contributors on the same issue.
+
+## Pull Request Checklist
+
+- Branch from the master branch and, if needed, rebase to the current master
+  branch before submitting your pull request. If it doesn't merge cleanly with
+  master you may be asked to rebase your changes.
+
+- Commits should be as small as possible, while ensuring that each commit is
+  correct independently (i.e., each commit should compile and pass tests).
+
+- Commits should be accompanied by a Developer Certificate of Origin
+  (http://developercertificate.org) sign-off, which indicates that you (and
+  your employer if applicable) agree to be bound by the terms of the
+  [project license](../LICENCE). In git, this is the `-s` option to `git commit`
+
+- If your patch is not getting reviewed or you need a specific person to review
+  it, you can @-reply a reviewer asking for a review in the pull request or a
+  comment, or you can ask for a review via [email](mailto:info@rustdesk.com).
+
+- Add tests relevant to the fixed bug or new feature.
+
+For specific git instructions, see [GitHub workflow 101](https://github.com/servo/servo/wiki/GitHub-workflow).
+
+## Conduct
+
+https://github.com/rustdesk/rustdesk/blob/master/docs/CODE_OF_CONDUCT-PL.md
+
+## Communication
+
+RustDesk contributors frequent the [Discord](https://discord.gg/nDceKgxnkV).